Ummm ... not exactly true but not exactly not-true either. Occupied BW
is a function of bit-rate [well, technically, number of signal
transitions in a unit time, but they're closely related]. Fairly basic
physics ... or I guess that's information theory now. The faster you
send, the wider your signal will be, guaranteed, you can't escape it.
Like trying to drive faster than light, discarding angular momentum, or
resigning from Linked-In.
Waveshape also affects occupied bandwidth, although the amount it
increases the BW carries no information ... except for the useless fact
that the dude with huge key clicks is still up there 15 KHz.
At "normal" CW speeds, aka D4C, the BW increase due to speed is hardly
noticeable. With poor wave shaping, it is VERY noticeable, and
information-free.
73,
Fred K6DGW
Sparks NV
Washoe County DM09dn
On 3/29/2016 1:03 PM, Vic Rosenthal 4X6GP/K2VCO wrote:
The relationship of bandwidth and speed is that for given rise/fall
times, increasing speed will reach a point when the code elements blur
together.
So you need more bandwidth for super high-speed CW because you need to
shorten the rise and fall times. But the occupied bandwidth doesn't
change as you vary the speed.
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